Howley, E. T., Franks, B. D., & Howley, E. T. 1. H. f. i. h. (2007). Fitness professional's handbook (Fifth edition.). Human Kinetics.
Cita Chicago (17th ed.)Howley, Edward T., B. Don Franks, i Edward T. 1943- Health fitness instructor's handbook Howley. Fitness Professional's Handbook. Fifth edition. Champaign, IL: Human Kinetics, 2007.
Cita MLA (9th ed.)Howley, Edward T., et al. Fitness Professional's Handbook. Fifth edition. Human Kinetics, 2007.
Atenció: Aquestes cites poden no estar 100% correctes.